To be fair, I think the bigger concern for most people isn't uptake into subsequent plantings, it is the residue finding it's way into the consumed seeds of the plants it was deliberately sprayed on.
That said though, the body has the ability to clean itself of toxins, as long as they are not consumed in amounts beyond the body's capacity to handle. With the amount of toxins the general population exposes themselves to on a 24/365 basis, to point the blame for general health problems on glyphosate from foods consumed is no different than placing the entire blame for a camel's back breaking on that final straw that pushed it over the edge.
Studies have concluded that glyphosphate is not directly toxic to humans. But does it affect human microbiota?
“...the residue finding it’s way into the consumed seeds of the plants it was deliberately sprayed on.”
Seeds contain two small tips of meristematic cells, and glyphosate could make its way there. Ultimate concentration would depend on the maturity of the seeds at the time of application. Beyond that, when the plant withers to a dry crunchy heap a week later, are the seeds dropped or still attached to the plant? Worthy of note is that the typical plants targeted in application of herbicides are undesirable weeds, not edibles, nor typically the seed-bearing plants most attractive to foragers.
Bottom line is I agree with your take that this investigation long ago left behind the world of the 80/20 Rule and is now way off into the tall grass of some fractional percentage of possible impact that will never be significant enough to amount to anything of note.